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    <title>Help On LaTeX Cross References</title>

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<h2>Cross References</h2>


<p>One reason for numbering things like figures and equations is

    to refer the reader to them, as in "See Figure 3 for more details."</p>


<h3>Sections, Equations, Tables, etc.</h3>


<p>One can generate numbered references to anything for which LaTeX

    maintains a <a href="ltx-3.html">counter</a> by placing a

    <tt><a href="ltx-252.html">\label</a></tt> command

    with some mnemonic name in the appropriate

    <a href="ltx-27.html">environment</a>. The reference is then generated

    by use of the <tt><a href="ltx-303.html">\ref</a></tt> command with the

    same mnemonic.</p>


<p>For example</p>



<pre>

  <tt>\begin{equation}

      <a href="ltx-252.html">\label</a>{eqno1}

      c <a href="ltx-404.html">\geq</a> <a href="ltx-319.html">\sqrt</a>{a^2+b^2+1}

      \end{equation}

      .... intervening text ...

      From Eq.~(<a href="ltx-303.html">\ref</a>{eqno1}) we see ...</tt>

</pre>


<p>Assuming that this is the first equation,

    the last line will produce "From Eq. (1) we see ..." Note the

    use of the <tt><a href="ltx-143.html">~</a></tt>

    to ensure that there is no line break between "Eq." and "(1)."

    Also note that the <tt>\ref</tt> command produces only the number;

    if you want the number to be in parentheses (as shown here) you have

    to include them in your text.</p>


<h3>Bibliographic citations</h3>


<p>Bibliographic citations work somewhat differently. The following

    should be consulted:</p>


<ul>

    <li><tt><a href="ltx-211.html">\cite</a></tt>

    <li><tt><a href="ltx-73.html">\thebibligraphy</a></tt>

</ul>


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<p>See also</p>


<ul>

    <li><tt><a href="ltx-252.html">\label</a></tt></li>

    <li><tt><a href="ltx-303.html">\ref</a></tt></li>

    <li><tt><a href="ltx-291.html">\pageref</a></tt></li>

</ul>


<ul>

    <li><tt><a href="ltx-211.html">\cite</a></tt></li>

    <li><tt><a href="ltx-73.html">\thebibligraphy</a></tt></li>

</ul>


<ul>

    <li><a href="ltx-3.html">Counters</a></li>

    <li><a href="ltx-27.html">Environments</a></li>

    <li><a href="ltx-141.html">Sectioning</a></li>

</ul>


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